HP StorageWorks 1/8 Tape Autoloader User and Service Guide (August 2005)

Diagnostics and troubleshooting48
Troubleshooting
Installation problems
Problems encountered during the installation of the autoloader are usually caused by improper
SCSI bus configuration, application software configuration errors, or an incorrectly configured
operating system. If the application software that you are using is not communicating with the
autoloader after installation, check the following:
• SCSI ID:
Ultrium 230, Ultrium 460 and SDLT 320 models: The autoloader uses one SCSI ID for the tape
drive and another SCSI ID for the autoloader robotics.
DLT VS80, Ultrium 232, Ultrium 448 and Ultrium 960 models: The autoloader uses a single
SCSI ID.
Depending on other devices attached to the same SCSI bus and their SCSI IDs, you may need
to change the SCSI ID of the autoloader or tape drive before you can use the autoloader.
Review the manuals for the other devices on the SCSI bus or your operating system to determine
which SCSI IDs are currently in use. See ”Changing the SCSI ID” on page 38 for instructions.
• LUN Scanning: DLT VS80, Ultrium 232, Ultrium 448 and Ultrium 960 models use dual LUNs to
control the tape drive (LUN 0) and autoloader robotic (LUN 1). These models require an HBA
that supports LUN scanning and LUN scanning must be enabled, see also ”LUN scanning” on
page 19.
• SCSI Cabling: Verify that all SCSI cables are securely connected at both ends. Check the length
and integrity of your SCSI cabling. Check the SCSI connector for bent pins. The length of the
internal SCSI cabling inside the autoloader is 2 feet (60 cm). This length must be included in
any calculations of cable length.
• For LVD SCSI the maximum length for a single device is 82 feet (25 meters). For multiple
devices, the maximum combined internal/external length is 40 feet (12 meters).
• If you have a combination of LVD and SE devices on the bus, the maximum cable length
reverts to the SE specification, which for Ultra devices is 10 feet (3 meters) for four or fewer
devices, and 5 feet (1.5 meters) for more than four devices.
• Termination: If the autoloader is the only SCSI device — other than the SCSI host adapter — on
the selected SCSI bus, it must be terminated. Likewise, if the autoloader is physically the last
SCSI device on the SCSI bus, it must be terminated. Only the devices physically located at the
beginning and end of the SCSI bus should be terminated. Refer to the manuals supplied with
other devices on the SCSI bus for information on enabling or disabling termination on those
devices.
• To terminate the autoloader, locate the terminator in the accessories package and press it
firmly into either of the two SCSI connectors on the rear panel of the autoloader. Secure the
terminator by tightening the finger-screws until snug. The supplied terminator is “dual mode”
and will work on both Low-Voltage Differential (LVD) and Single Ended (SE) SCSI buses.
Check all SCSI and power connections and confirm that the unit is attached to a valid SCSI
SE or LVDS bus.